Dockerizing app

.gitignore

@@ -0,0 +1,2 @@
+__pycache__
+.vscode

Dockerfile

@@ -0,0 +1,13 @@
+FROM ubuntu:16.04
+
+RUN apt-get update -y
+RUN apt-get install -y python3 python3-pip python3-dev build-essential libssl-dev libffi-dev
+
+COPY . /app
+
+WORKDIR /app
+
+RUN pip3 install --upgrade pip
+RUN pip3 install -r requirements.txt
+
+CMD ["python3", "run.py"]

README.md

@@ -4,6 +4,20 @@ This is a simple example of Python Flask's usage as a simple "Task Manager" usin
 
 ### Installation
 
+#### Docker
+
+Using Docker compose, you can run this using one command:
+
+```bash
+$ docker-compose up
+```
+
+It will run pip install and also pull mongodb container as requirement of this project. Then you can access `localhost:80` (yes it is in port 80 since in `docker-compose.yml` it exposed to host port 80, you can change it if you like!).
+
+#### Old way
+
+> Don't forget to install python 3 if you don't have it, because this project use python 3 syntax such as `print()` function.
+
 First, you should [install MongoDB](https://docs.mongodb.com/manual/installation/)
 
 then install all dependencies by run the following command:
@@ -28,7 +42,7 @@ then, run the program:
 $ python run.py
 ```
 
-Open your browser and go to `localhost:5000	` to see the running program.
+Open your browser and go to `localhost:5000` to see the running program.
 
 ### External References:
 

docker-compose.yml

@@ -0,0 +1,18 @@
+version: '2'
+services:
+  mongo:
+    image: mongo:3.4
+    volumes:
+      - /data/db
+  flask_mongodb:
+    build: .
+    ports:
+      - "80:5000"
+    environment:
+      - PORT=5000
+      - MONGODB_URL=mongo:27017
+      - SECRET_KEY=1234567890asdfghjkl
+    links:
+      - mongo 
+    depends_on: 
+      - mongo

run.py

@@ -1,11 +1,17 @@
+import os
 from flask import Flask, render_template, redirect
 from pymongo import MongoClient
 from classes import *
 
+# get from env variable, follows 12 factor app (https://12factor.net/config)
+SECRET_KEY = os.getenv('SECRET_KEY', 'randomkeys')
+MONGODB_URL = os.getenv('MONGODB_URL', 'localhost:27017')
+PORT = os.getenv('PORT', '5000')
+
 # config system
 app = Flask(__name__)
-app.config.update(dict(SECRET_KEY='yoursecretkey'))
-client = MongoClient('localhost:27017')
+app.config.update(dict(SECRET_KEY=SECRET_KEY))
+client = MongoClient(MONGODB_URL)
 db = client.TaskManager
 
 if db.settings.find({'name': 'task_id'}).count() <= 0:
@@ -92,4 +98,10 @@ def main():
             data = data, reset = reset)
 
 if __name__=='__main__':
-    app.run(debug=True)
+    # The web server running in your container is listening for connections on port 5000
+    # #of the loopback network interface (127.0.0.1). As such this web server will only respond to http requests
+    # originating from that container itself.
+    # In order for the web server to accept connections originating from outside of the container
+    # you need to have it bind to the 0.0.0.0 IP address. 
+    # see answer here https://stackoverflow.com/a/26434706/5489910
+    app.run(host='0.0.0.0', port=PORT)